Part of speech:
Below the level of the surrounding or adjoining area
Of, or occurring in, the region below the surface of the earth
Operating in a hidden or confidential manner:
Hidden, furtive, secretive.
Lying below the surface, esp. of the earth, the oceans, etc.
Relating to or occurring on or near the surface of the earth.
(Informal) Utterly ruined; undone
The definition of hidden is concealed.
A large cave.
A naturally occurring underground hollow or passage, especially one with an opening to the surface of the Earth. Caves can form through a variety of processes, including the dissolution of limestone by flowing water, the differential cooling of volcanic magma (which occurs when the outside surface of the lava cools, but the inside continues to flow downwards, forming a hollow tube), or the action of wind and waves along a rocky coast.
The definition of ulterior refers to something intentionally hidden, not revealed or below the surface.
Part or all of this entry has been imported from the 1913 edition of Webster's Dictionary, which is now free of copyright and hence in the public domain. The imported definitions may be significantly out of date, and any more recent senses may be completely missing.
Find another word for subterranean. In this page you can discover 19 synonyms, antonyms, idiomatic expressions, and related words for subterranean, like: concealed, sunken, hypogeal, secret, subterraneous, furtive, underground, subsurface, surface, sunk and hidden.